CN101316133B - Multimedia broadcast multicast service transmission method and device - Google Patents
Multimedia broadcast multicast service transmission method and device Download PDFInfo
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- CN101316133B CN101316133B CN2007100997759A CN200710099775A CN101316133B CN 101316133 B CN101316133 B CN 101316133B CN 2007100997759 A CN2007100997759 A CN 2007100997759A CN 200710099775 A CN200710099775 A CN 200710099775A CN 101316133 B CN101316133 B CN 101316133B
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Abstract
The invention discloses a multimedia broadcast multicast service transmission method, which relates to the MBMS transmission technique, aiming at solving the non-synchronous problem during the MBMS transmission. The technical proposal provided by the invention is that: when the MBMS is broadcast, a CFN is set for the MBMS data package and then the data package is copied to each related FACH FP channel; after each related Node B receives the MBMS data package through the FACH FP channels, the SFN to be transmitted can be calculated according to the CFN of the MBMS data package, so the air interface transmitting time of the MBMS data package can be determined. The invention also discloses a device for realizing the transmission method. The high synchronization of the MBMS data transmission provided by the invention does not generate desynchronizing accumulation and has good compatibility.
Description
Technical field
The present invention relates to GSM transmitting multimedia broadcast multicast service (MBMS, MultimediaBroadcast Multicast Service) technology, relate to multimedia broadcast multicast service transmission method and device or rather.
Background technology
In order to effectively utilize the mobile communications network resource; The MBMS of mobile communications network has been proposed among 3G (Third Generation) Moblie global standards tissue (3GPP) Release6; Thereby in mobile communications network, provide a data source to send the point-to-multipoint service of data to a plurality of users; The realization Internet resources are shared, and improve utilization rate of network resource, the sharing of the interface resource of especially eating dishes without rice or wine.
For supporting the transfer of data of MBMS user plane and control plane, the MAC-m entity that in media access control MAC-c/sh, has increased a multicast functionality is used to handle the scheduling of MBMS related service channel.MAC-m sends the MBMS data through forward access channel (FACH, Forward Access Channel).
Fig. 1 is for existing MBMS transmitting device structural representation, and is as shown in Figure 1, in existing MBMS device; Radio network controller (RNC; Radio Network Controller) be connected in core net (CN, Core Network) through the Iu interface, Node B is connected in RNC through Iub interface.On a plurality of cell synchronizing ground of a service area during MBMS transmission data; Radio network controller (RNC) is set up a packet data convergence protocol (PDCP to a plurality of sub-districts in this service area; Packet DataConvergence Protocol) entity, a Radio Link control (RLC; Radio Link Control) entity, and to setting up separately MAC-m entity and Frame Protocol (FP, FrameProtocol) entity respectively in each sub-district.RNC is professional to each MBMS, and a PDCP and RLC are shared in the one group of sub-district that belongs in the same service broadcast zone when putting multiple spot (P-T-M) transmission.This group sub-district is called MBMS cell set (MBMS Cell Group).Rlc layer is to adopt non-affirmation UM mode MBMS transmission data, each professional shared UM RLC entity.The professional UM RLC entity of sharing sends business datum to the MAC-m entity of all corresponding sub-districts of this business.
During the MBMS data to be broadcast that receive that the upper strata sends; PDCP entity, RLC entity, MAC-m entity and FP entity carry out PDCP encapsulation, RLC encapsulation, MAC encapsulation and FP encapsulation to these MBMS data to be broadcast respectively; And be that above-mentioned MBMS packet to be broadcast carries out Connection Frame Number (CFN, Connection Frame Number) configuration by the FP entity.The CFN that the required transmitting time of eating dishes without rice or wine of each Node B synchronized transmission data is disposed by the FP entity just controls; And because each sub-district each has oneself MAC-m entity and FP entity; Between RLC and MAC-m entity and FP entity, do not lose under the situation of MBMS packet; The CFN of MBMS packet that still can guarantee to mail to each sub-district is consistent, but each base station synchronized transmission MBMS data like this.If but have under the situation of losing the MBMS packet between RLC and some MAC-m entity and the FP entity; Then can cause the eat dishes without rice or wine transmitting time difference of MBMS data at different districts; It will be no longer synchronous that the data of each Node B are sent; This has not only reduced the grand diversity performance of user terminal UE, and has brought bigger interference.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of multimedia broadcast multicast service transmission method and device, can make each the Node B in the broadcast area synchronously send the MBMS data.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of multimedia broadcast multicast service transmission method comprises:
During broadcasting MBMS, for again it being copied in each relevant FACHFP passage behind the MBMS packet configuration CFN.
Wherein, this method also comprises:
After each relevant Node B receives the MBMS packet through FACH FP passage, calculate its SFN when to be sent, confirm the transmitting time of eating dishes without rice or wine of this MBMS packet according to the CFN of this MBMS packet.
Wherein, saidly be specially for copying to each relevant FACH FP passage again behind the MBMS packet configuration CFN: the CFN of said MBMS packet is then multiplexed in each relevant FACHFP passage by a FP physical arrangements.
Wherein, before the configuration CFN, MBMS packet to be broadcast carries out the MAC encapsulation through a MAC-m entity.
Wherein, the sub-district of broadcasting MBMS is confirmed by core net CN.
Wherein, said each relevant FACH FP passage is confirmed according to the sub-district of broadcasting MBMS.
A kind of multimedia broadcast-multicast service transmitting device; Include the radio network controller (RNC) that is connected between CN and the Node B; Said RNC comprises packet data convergence protocol PDCP entity, Radio Link control RLC entity, MAC-m entity and the FP entity that connects in order, and wherein, said PDCP entity is connected in CN through the Iu interface; Said FP entity is connected in Node B through FACH FP passage, and the MAC-m entity and the FP entity of encapsulation MBMS data are one; During broadcasting MBMS, said FP entity copies to it in each relevant FACH FP passage after for MBMS packet configuration CFN again.
Wherein, said FP entity comprises:
The CFN dispensing unit is used for the MBMS packet to be broadcast from the MAC-m entity is carried out the CFN configuration;
MBMS packet multiplexing unit is used for carrying out multiplexing to the MBMS packet of configuration CFN;
FACH FP channel interface is used for to each Node B the data connecting interface being provided.
Wherein, after said Node B receives the MBMS packet that the FP entity sends, calculate its SFN when to be sent, confirm the transmitting time of eating dishes without rice or wine of this MBMS packet according to the CFN of this MBMS packet.
Wherein, said CN is used for confirming the sub-district of broadcasting MBMS; Said MBMS packet multiplexing unit is according to the FACH FP channel interface of determined cell reuse to correspondence.
The present invention is when broadcasting MBMS data; Encapsulation through a MAC-m entity and a FP entity completion MBMS packet; And by the CFN configuration of FP entity realization to the MBMS packet; And then the MBMS packet that will dispose CFN copies to the corresponding FACH FP passage of each broadcast cell, thereby is sent to each Node B, accomplished by Node B and sends.Because the present invention's MBMS packet to be broadcast just duplicates and send to Node B after having disposed CFN, for identical MBMS packet, the CFN of each NodeB side is always identical, so MBMS data to be broadcast synchronized transmission always.Even the phenomenon of some data-bag lost has appearred in the NodeB side, can not cause interference to other sub-districts yet,, next MBMS packet still can guarantee when arriving and the data sync of other sub-district, can not cause the step-out accumulation.
Description of drawings
Fig. 1 is existing MBMS transmitting device structural representation;
Fig. 2 is a MBMS transmitting device structural representation of the present invention;
Fig. 3 is the structural representation of FP entity of the present invention;
Fig. 4 is the MBMS packet structure sketch map after the encapsulation of FP entity;
Fig. 5 is the schematic flow sheet of MBMS transmission method of the present invention.
Embodiment
Core concept of the present invention is: when the 3G system carries out the transmission of MBMS data; Realize CFN configuration through a FP entity to the MBMS packet; And then the MBMS packet that will dispose CFN copies to the corresponding FACH FP passage of each broadcast cell; The FACH FP passage of each Node B through separately receives this and disposed the MBMS packet of CFN, then with its synchronized transmission.The present invention can guarantee that theoretically the MBMS data of each Node B transmission are always synchronous.Below in conjunction with accompanying drawing technical scheme of the present invention is elaborated.
Fig. 2 is a MBMS transmitting device structural representation of the present invention; As shown in Figure 2, MBMS transmitting device of the present invention is on the basis of existing 3G transmitting device, to improve to form, and it includes the RNC that is connected between CN and the NodeB; RNC comprises packet data convergence protocol PDCP entity, Radio Link control RLC entity, MAC-m entity and the FP entity that connects in order; The PDCP entity is connected in CN through the Iu interface, and the FP entity is connected in Node B through FACH FP passage, and different is with existing transmitting device; To each MBMS data broadcasting zone, the present invention adopts a MAC-m entity and a FP entity that MBMS data to be broadcast are encapsulated.The function of MAC-m entity and structure are all identical with existing MAC-m entity among the present invention, promptly accomplish the MAC encapsulation to the MBMS packet, but its disposal ability are stronger, to adapt to the data processing requirement of whole device.The FP entity is accomplished all MBMS packets to be broadcast is carried out the CFN configuration successively, arrives Node B through corresponding FACH FP channel transfer again after the MBMS packet that will dispose CFN then duplicates, and is sent at each broadcast cell by Node B.Before the MBMS transmission packet; Need confirm the zone of transmission by CN; Confirm to cover according to the transmission region of confirming by which sub-district; And then the ID of sub-district to be transmitted is issued to RNC, and RNC is configured the FP entity according to the sub-district ID that receives, and the FP entity is established to the FACH FP passage of respective cell.It will be appreciated by those skilled in the art that by CN realize that the zone of transmission is confirmed, RNC accomplishes that the configuration of FP entity and FP entity are set up FACH FP passage all is to realize easily.
Fig. 3 is the structural representation of FP entity of the present invention; As shown in the figure; FP entity of the present invention comprises CFN dispensing unit 30, MBMS packet multiplexing unit 31 and FACH FP channel interface 32; Wherein CFN dispensing unit 30 is connected in the MAC-m entity, is used for the MBMS packet to be broadcast from the MAC-m entity is carried out the CFN configuration.MBMS packet multiplexing unit 31 is connected in CFN dispensing unit 30, is used for carrying out multiplexing to the MBMS packet of configuration CFN.FACH FP channel interface 32 is used for to each Node B the data connecting interface being provided, to receive the MBMS packet to be broadcast after the FP entity encapsulates.FACH FP channel interface 32 of the present invention with the device in each Node B be connected respectively.Aforementioned CN can give RNC with the cells of its broadcasting MBMS data of confirming, RNC disposes the FACH FP passage of respective cell when setting up the FP entity according to the broadcast cell of confirming.These processes are just completed before the MBMS transfer of data.MBMS packet multiplexing unit 31 directly is multiplexed into FACH FP channel interface 32 according to the MBMS packet that will dispose CFN, is sent to each Node B of opposite end again through FACH FP passage.
For understanding the present invention better, the concrete structure of the MBMS packet after the encapsulation of FP entity once is described.Fig. 4 is the MBMS packet structure for 3GPP agreement regulation: comprise head (Header) portion and payload (Payload) portion.Head has Connection Frame Number CFN, in the FP entity, is configured; Fill in each transmission block (TB, Transmission Block) in the payload portion order, to a last TB, and provide idle extended field (Spare Extension) from first TB.Because above-mentioned packet structure is the standard of agreement defined, repeats no more here.
After each Node B receives the MBMS packet that the FP entity sends, confirm System Frame Number (SFN, System Frame Number) according to the CFN of this MBMS packet, thereby confirm the sending order of MBMS packet.Wherein, the definite of SFN can try to achieve according to following formula:
CFN＝SFN?mod?OFFSET
Wherein mod representes that delivery calculates; CFN is a Connection Frame Number, circulation continuously successively between 0～255 when disposing for the MBMS packet; SFN is a System Frame Number, circulation continuously successively between 0～4095.For FACH, OFFSET is unified to be defined as 256.It is thus clear that behind the CFN that has confirmed the MBMS packet, each Node B can confirm the SFN of this MBMS packet according to above-mentioned formula, that has also promptly confirmed to send eats dishes without rice or wine the time, and at the delivery time of confirming of eating dishes without rice or wine, the MBMS packet that sends this SFN gets final product.
Because the present invention has disposed CFN at the MBMS packet just to copy in the corresponding FACH FP passage of each broadcast cell; Therefore the CFN of the identical MBMS packet that receives of each Node B is definitely identical; And the SFN of this MBMS packet that Node B calculates is also necessarily identical, when sending, will be synchronous therefore.Even the packet loss phenomenon has taken place, also just in some sub-district a certain moment lose these MBMS data, and will not have influence on next packet synchronously, also be that the step-out of MBMS data packet transmission of the present invention can not form accumulation.Because the present invention adjusts some entities of existing apparatus, its function does not separately change, and does not therefore relate to the change of common transmission protocols, and its compatibility is very good.
Following brief account is to understand the transmission of MBMS data service of the present invention better.
Fig. 5 is the schematic flow sheet of MBMS transmission method of the present invention, and as shown in Figure 5, MBMS transmission method of the present invention may further comprise the steps:
Step 501: when the MBMS transmission data, confirm zone to be broadcast, thereby confirm sub-district waiting for transmission, the sub-district ID that confirms and MBMS data distributing waiting for transmission to RNC, are accomplished the configuration to FP entity etc. by RNC by CN.Specifically can repeat no more here referring to the associated description of preamble MBMS transmitting device part.
Step 502: MBMS data to be broadcast are encapsulated, copy to respectively in the corresponding FACH FP passage according to definite sub-district again behind each MBMS packet configuration CFN.The work of MBMS data encapsulation is accomplished by each entity of RNC configuration.The present invention only adopts a MAC-m entity and a FP entity that the MBMS data are encapsulated.MAC-m entity of the present invention is identical with existing structure and function, and the concrete structure of FP entity can be referring to the associated description of MBMS transmitting device part of the present invention., the FP entity copies to again in the FACH FP passage after accomplishing the CFN configuration to the MBMS packet.The FACH FP passage here is to confirm according to the sub-district ID in the step 501, and about confirming of FACH FP passage, preamble MBMS transmitting device is described.
Step 503: the MBMS packet that each Node B receives configuration CFN calculates its SFN, sends this MBMS packet according to the SFN that calculates in the corresponding moment.Concrete computational methods can be referring to the computing formula of MBMS transmitting device part of the present invention.Behind the SFN that has confirmed MBMS packet to be transmitted, guaranteed that promptly the delivery time of eating dishes without rice or wine of all MBMS packets that SFN is identical is identical, these MBMS packets waiting for transmission will be synchronous like this.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.
Claims (8)
1. a multimedia broadcast multicast service transmission method is characterized in that, this method comprises:
During broadcast multimedia broadcast multicast service MBMS, for again it being copied in each relevant forward access channel FACH Frame Protocol FP passage behind the MBMS packet configuration Connection Frame Number CFN,
Wherein, this method also comprises:
After each relevant Node B receives the MBMS packet through FACH FP passage, calculate its system frame number SFN when to be sent according to the CFN of this MBMS packet, confirm the transmitting time of eating dishes without rice or wine of this MBMS packet, wherein, SFN can try to achieve according to following formula:
CFN＝SFN?mod?OFFSET
Wherein, mod representes that delivery calculates; CFN is a Connection Frame Number, circulation continuously successively between 0～255 when disposing for the MBMS packet; SFN is a System Frame Number, circulation continuously successively between 0～4095; OFFSET is unified to be defined as 256.
2. multimedia broadcast multicast service transmission method according to claim 1; It is characterized in that; Saidly be specially for copying to each relevant FACH FP passage again behind the MBMS packet configuration CFN: the CFN of said MBMS packet is then multiplexed in each relevant FACH FP passage by a FP physical arrangements.
3. multimedia broadcast multicast service transmission method according to claim 2 is characterized in that, before the configuration CFN, MBMS packet to be broadcast carries out the MAC encapsulation through a MAC-m entity.
4. multimedia broadcast multicast service transmission method according to claim 2 is characterized in that, the sub-district of broadcasting MBMS is confirmed by core net CN.
5. multimedia broadcast multicast service transmission method according to claim 4 is characterized in that, said each relevant FACH FP passage is confirmed according to the sub-district of broadcasting MBMS.
6. multimedia broadcast-multicast service transmitting device; Include the radio network controller (RNC) that is connected between CN and the Node B, said RNC comprises packet data convergence protocol PDCP entity, Radio Link control RLC entity, MAC-m entity and the FP entity that connects in order, wherein; Said PDCP entity is connected in CN through the Iu interface; Said FP entity is connected in Node B through FACH FP passage, it is characterized in that, the MAC-m entity and the FP entity of encapsulation MBMS data are one; During broadcasting MBMS, said FP entity copies to it in each relevant FACH FP passage after for MBMS packet configuration CFN again,
Wherein, after said Node B receives the MBMS packet that the FP entity sends, calculate its SFN when to be sent according to the CFN of this MBMS packet, confirm the transmitting time of eating dishes without rice or wine of this MBMS packet, wherein, SFN can try to achieve according to following formula:
CFN＝SFN?mod?OFFSET
Wherein, mod representes that delivery calculates; CFN is a Connection Frame Number, circulation continuously successively between 0～255 when disposing for the MBMS packet; SFN is a System Frame Number, circulation continuously successively between 0～4095; OFFSET is unified to be defined as 256.
7. multimedia broadcast-multicast service transmitting device according to claim 6 is characterized in that, said FP entity comprises:
The CFN dispensing unit is used for the MBMS packet to be broadcast from the MAC-m entity is carried out the CFN configuration;
MBMS packet multiplexing unit is used for carrying out multiplexing to the MBMS packet of configuration CFN;
FACH FP channel interface is used for to each Node B the data connecting interface being provided.
8. multimedia broadcast-multicast service transmitting device according to claim 7 is characterized in that, said CN is used for confirming the sub-district of broadcasting MBMS; Said MBMS packet multiplexing unit is according to the FACH FP channel interface of determined cell reuse to correspondence.
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| CN2007100997759A CN101316133B (en) | 2007-05-30 | 2007-05-30 | Multimedia broadcast multicast service transmission method and device |
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| CN2007100997759A CN101316133B (en) | 2007-05-30 | 2007-05-30 | Multimedia broadcast multicast service transmission method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102263586B (en) * | 2010-05-31 | 2015-02-04 | 大唐移动通信设备有限公司 | Method, system and device for transmitting data frames |
| CN103796170B (en) | 2012-11-02 | 2017-11-21 | 电信科学技术研究院 | A kind of method, system and equipment for transmitting data |
| CN111726326A (en) * | 2019-03-21 | 2020-09-29 | 成都鼎桥通信技术有限公司 | Data transmission method, base station and user equipment |
| CN111541998B (en) * | 2020-04-03 | 2021-12-17 | 深圳市科思科技股份有限公司 | Multicast transmission method, system, device and storage medium |
| CN114390444B (en) * | 2020-10-16 | 2023-04-07 | 维沃移动通信有限公司 | SN synchronization method, device and equipment of multicast broadcast service and readable storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1387591A1 (en) * | 2002-07-31 | 2004-02-04 | SAMSUNG ELECTRONICS Co. Ltd. | Apparatus and method for providing MBMS service in a mobile communication system |
| CN1496041A (en) * | 2002-06-14 | 2004-05-12 | ���ǵ�����ʽ���� | Equipment and method for determining soft switchover for CDMA mobile communication system |
| CN1943138A (en) * | 2005-01-05 | 2007-04-04 | 摩托罗拉公司 | Method and apparatus for scheduling and synchronizing a multimedia broadcast/multicast service |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1496041A (en) * | 2002-06-14 | 2004-05-12 | ���ǵ�����ʽ���� | Equipment and method for determining soft switchover for CDMA mobile communication system |
| EP1387591A1 (en) * | 2002-07-31 | 2004-02-04 | SAMSUNG ELECTRONICS Co. Ltd. | Apparatus and method for providing MBMS service in a mobile communication system |
| CN1943138A (en) * | 2005-01-05 | 2007-04-04 | 摩托罗拉公司 | Method and apparatus for scheduling and synchronizing a multimedia broadcast/multicast service |
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